Curve K tolerates motor inrush without nuisance tripping. Rated 277 V AC and 500 V DC, with an interrupting capacity of 6 kA at AC and 10 kA at DC. The DC rating is notably higher than the AC — useful for DC bus or battery-backed circuits where fault currents can be lower but sustained. The 6 kA AC interrupting rating covers standard commercial and light industrial panelboard fault levels; verify it against your available fault current before specifying. The 3-pole form factor occupies three modular units of DIN space (each 17.5 mm wide), so factor that into your panel fill.
The S200MUC series uses a clip-on mechanism — press onto the rail, engage the bottom latch, and it locks in. No tools needed for installation; removal requires a flat-blade screwdriver to release the latch.